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WALTE G. KELLEY & ALLAN C.PETERSON, . (2001). Difference Equations. Bound: Elsevier.
WALTE G. KELLEY & ALLAN C.PETERSON, . 2001. Difference Equations. Bound: Elsevier.
WALTE G. KELLEY & ALLAN C.PETERSON, . Difference Equations. Bound: Elsevier. 2001.